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(No Model.) 2 Sheets-Sheet 1. A. T. STRAUGH. REPEATING AUTION FOR GRAND PIANOS.

No. 404,876. Patented June 11, 1889.

WITNESEEE W Mfg/M 2 Sheets-Sheet 2.

(No Model.)

A. T. STRAUOH. REPEATING ACTION FOR GRAND PIANOS.--

No. 404,876. Patented June 11, 1889.

WITNESSES N. PEYERS. Pholn-Lvll To all whom, it may concern:

UNITED STATES PATENT Orricriz.

ALBERT T. STRAUCH,

OF NEIV YORK, N. Y.

REPEATING -ACTION FOR GRAND PIANOS.

SPECIFICATION forming part of Letters Patent No. 404,876, dated June 11, 1889.

Application filed December 22, 1888. Serial No. 294,419. (No model.

Be it known that I, ALBERT T. STRAUCH, of New York city, New York, have invented a new and Improved Repeating-Action for Grand Pianos, of which the following is a specification.

This invention relates to an improved repeating-action for grand pianos.

The invention consists in the various features of improvement more fully pointed out in the claims.

In the accompanying drawings, Figure 1 is a sectional elevation of my improved action, showing the key raised. Fig. 2 is a similar elevation with the key depressed. Fig. 3 is a detail vertical central section through the regulating-buttonsq 0", showing some parts in side View. Fig. i is a side view of a modification of the whip-spring.

The letter (t represents the key of the action, connected, as usual, by intermediate mechanism b to the support 0, pivoted to flange c; From the support 0 there projects upwardly the whip-flange e,to which is pivoted the whip (Z. This whip is slotted, as usual, for the admission of the upper end of the fly or jack f, pivoted to support 0. The lower end of the jack is adapted to come into contact with the regulating-button g, also as usual.

his the hammer-flange, to which the shank i of the hammer j is pivoted. The shank 1' is provided with the butt 7c, to act in conjunction with the jack. m is the back-check secured to the end of the key a.

For the proper operation of the parts it is necessary to use two springs, the jack-spring and the whipspring, and it is also of importance that the tension of both these springs may be readily regulated. The j ack-spring n is placed between a forward extension 0 of support 0 and between a lug f, projecting p is the whip-spring secured, in the manner to be described, between the support a and the whip d. The ends of the spring 13 rest in a pair of mortised buttons q r. The upper button q may be termed the whip-button, and is secured to the whip by a screw-rod q, that is screwed through the whip and into the button. The lower or support-button r is similarly secured to the support 0 by a screwrod r, that is screwedthrough the support and into the button. The ends of the rods q 0* project respectively over the whip and underthe support, and are thus readily accessible. If the tension of the whip-spring is to be altered, it is only necessary to turn either one of the screws q 0", when its button will be raised or lowered to change the height of the spring. The lower button r serves at the same time as-a stop for the jack-regulating button 3, that comes into contact with the button when the key is raised, as in Fig. 1, and prevents the jack from flying back too far.

In Fig. JEI have shown a modification of the buttons between which the whip-spring p is confined. In this modification the upper button q alone is adjustable by means of its screw-rod q, as already described; but the lower button r is directly attached to the supportc and is not adjustable. In this modification, therefore, the spring is to be regulated by one button alone.

The operation of the device is as follows: The jack in its normal position with the key raised, Fig. 1, is with its upper end directly beneath the hammer-butt 7;. Upon a depression of the key the jack throws the hammer up, and then (coming into contact with button g) clears the butt 7;, so that the hammer,

after striking the string t, can drop down against the back-check m, Fig. 2. In this position the hammer-butt is supported upon the whip d, and this in turn bears upon the spring 2), which is accordingly compressed. The

jack, by having been thrown forward, has also compressed the jack-spring n. Upon a partial release of the key the back-check m is lowered to release its hold upon the hammer. The spring p is now free to throw the whip cl, and with it the hammer-butt 7.2, up to a slight extent, sufficient for the jack-spring 02 to bring the upper end of the jack beneath the hammer-butt 1; for the next depression of the key. Thus the proper repeating-action is obtained. A full release of the key of course 5 also brings the jack beneath the hammerbntt.

hat I chtim is 1. The combination, in it i'epezttii'lg-a-etion, of support 0 and whip (Z with the whipspring IO 2), and with a button for adj nstztbly securing the spring to the support and whip, and with the jack f, having; regulating-button s, that is 

